Rolling mill guide



July 14, 1931. P. G. PALMGREN 1 ROLLING MILL GUIDE Filed Oct. 17. 1929 2 Sheets-Sheet 1 INVENTOR PER GUNNAR/DALMGIPE/V 4. ATTORNEY July 14, 1931. P. e. PALMGREN 1,814,735

ROLLING MILL GUIDE Filed Oct. 17, 1929 2 Sheets-Sheet 2 INVENTOR PEA SUN/m1? Pnuwcmf/v BY MM ATTORNEY Patented July 14, 1931- UNITED STATES PATENT OFFICE PER GUNNAR PALMGREN, OF GOTTENBORG, SWEDEN, ASSIGNOB TO AKT'IEBOLAGET SVENSKA KULLAGERFABBIKEN, 0F GOTTENBORG, SWEDEN, A CORPORATION OF SWEDEN ROLLING MILL GUIDE Application filed October 17, 1929, Serial No. 400,207, and in Sweden October 23, 1928.

In many cases it is usual to provide a guide before the rolls in rolling mills in order to guide the material to the pass and to prevent it from twisting in the pass.

When; material with oval section enters a round pass, it is necessary for the guide to fit snugly about the material in order to give satisfactory results. This makes it more difficult for the material to enter the guide, and automatic entering is impossible, unless the guide is opened'sufiicientlyto allow the material easy access. If material of oval section is" to be rolled in a square pass, the guidance will be very unsatisfactory and the shape of the material after passing through the mill will ,not be that desired. The above disadvantages are to be found in looping mills in. which the stands are placed side by side as well as in continuous mills in which the stands are placed one after the other. M y

In other cases, for example, when a square section is to enter an oval pass, the chief function of the guide is to guide the material in a lateral direction so that it enters the pass symmetrically, If the guide is too loose, the material in most cases does not enter the pass in the centre and consequently fills the pass unequally.

\Vhen the material is entered by hand, it is possible to'make the passage in the guide sufficiently small, but the process is more expensive partly on account of the extra help required and partly because the speed must be kept down sufliciently to allow the workman suflicient time to seize the material with the tongs and return it to the next pass.

The present invention is for the purpose of avoiding the above mentioned disadvantages and consists mainly of an arrangement by which the guide is kept open to allow the material to enter and is automatically closed after the material has been gripped by the rolls; .By this means the entrance of the material into the guide is reatly facilitated, while a satisfactory guidance is obtained. The guide may be maneuvered either electrically, hydraulically, pneumatically, mechanically or by any suitable combination of the above. The impulse required to make the closing mechanism function may be obtamed in several ways as explained in the following The invention makes it possible to use rcpeaters on both sides of the mill even when an oval section is to enter a square pass and still obtain the same high quality of work as by hand, while reducing the number of helpers required. Since the material can be looped over automatically, the speed of the rolls can be considerably increased with a corresponding. increase in the capacity of the mill. In continuous mills it is possible to obtain the same accurate dimensions as in looping mills if stretching is avoided between the stands.

The accompanying drawings show the preferred form of .an embodiment of the invention, in which drawings Figure 1 shows an 'axial section through a guide, the rolls being shown in cross-section, and

Fig. 2 is a front elevation of a mill equipped with my improvement.

A pair of work rolls 15 and 16 are illustrated between which is to be passed the bar 14: for the purpose of reducing it. The purpose of the invention is to guide the oncoming portion of the bar as it is passing between the rolls.

The guide is represented as comprising two halves denoted by the numerals 1 and 2 which are carried by bell crank levers 32 33 rotatable about a fixed pivot 34. The bell crank levers are connected to links 37 and 38 by means of ,joints 35 and '36. The links 37 and 38 are connected to a bar 11 through The circuitcan be closed or broken in the' manner illustrated. lVhcn the guide is open, the 11121136113114.- enters the pass between the rolls l5 and 16 and after the end has passed between the rolls, it comes into contact with a contact arm 18 pivoted at 17. Fixed to the arm 18 and movable therewith is a flexible contact arm 19 provided at its outer end with a contact'20. As the contact arm 18 is swung about the pivot 17 the contact 20 connects with another contact 21 thus closing 5 the circuit. The magnet then lifts the core and the guide is closed. When the material has passed through thepass the contact arm 18 falls down, either of its own weight or under the influence of a spring or other suitable means, and the circuit is broken and the guide open.

The speed of the wire in continuous wire rolling mills sometimes exceeds 20 m/sec. As a certain amount of time is required for the device to function and close the guide, the endof the wire will thus have timeto run several meters before the guide is closed. On this. account it may sometimes be advisable to allow the guide closing arrangement of one stand to be controlled by a releasing mechanism on the previous stand or at any suitable location between the stands. It should, however, be seen to that the rolls grip the wire before the guide is closed.

Having described my invention, I claim and desire to secure by Letters Patent:

1. The combination with a mill provided with rolls, of guides for the material adapted to open and close, and an electro-magnetic device associated with the guides and adapted to close the guides after the material has been gripped by the rolls, and to open the guides after the material has passed from the rolls.

2. The combination with rolls of a rolling mill, of a guide for the material adapted to open and close, an electro-magnet for actuating the guides, and a tripping device in the path of movement of the material pass- 40 ing from the rolls constructed and adapted for closing the circuit of the magnet upon the forward end of the material passing from the rolls, and to open the circuit upon the rear end of the material passing out from the rolls.

3. The combination with a rolling mill, of a guide for the material adapted to open and close and electro-magnet for actuating the guide, a circuit closer for the circuit of the magnet, and a pi'voted arm associated with the circuit closer and adapted to lie in the path of movement of the material coming from the rolls.

In testimony whereof I have signed my name.

PER GUNN AR PALMGREN. 

